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Old 04-16-2007, 03:36 PM   #1
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Tech: Engine revving at 2000 RPM

About a week ago I noticed that my TJ Rubicon begins to really 'rev' when I hit about 2000 RPM. Yesterday, I took a 250 mile drive to Dallas and my gas mileage was substantially lower than it has ever been (I got 180 miles on a full tank of gas). Does anyone have any idea what, if any, correlation there may be between this engine revving and low gas mileage? Any ideas what could be causing this? Any help would be greatly appreciated. Thanks.

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Old 04-16-2007, 04:39 PM   #2
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Wel with it reving higher its deffinatly going to be sucking more gas... as for what the problem is I really havn't a clue.

TPS Sensor, idle air control valve? Could be a number of things... or something simple like a loose vacum hose.

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Old 04-16-2007, 04:46 PM   #3
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To me that sounds like a vac leak. You could check by spraying your vac lines with carb cleaner and see if it revs. If it revs there a leak.
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Old 04-16-2007, 04:59 PM   #4
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Thanks for the tip. Someone else had also suggested it may be a clutch fan. Have any of you ever had a clutch fan problem before?
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Old 04-16-2007, 05:01 PM   #5
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Thanks for the tip. Someone else had also suggested it may be a clutch fan. Have any of you ever had a clutch fan problem before?
I don't think a fan clutch would cause it to rev. But I don't really know.
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Old 04-16-2007, 06:09 PM   #6
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Does it have a high rev sitting idle also?? This is the problem I just had, it was fine one minute and then the next time I cranked it up the RPMs shot up to atleast 2000 and stayed there. I uninstalled the throttle body and cleaned it (which was much needed) and also disconnected and cleaned the "sensors" (they were all gummed up) that are attached to the TB and now it purrrrs like a kitten. This may not be your problem but it's still a good idea to take out the throttle body and clean it along with it's components, especially if your Jeep is a few years old. I guess that ??"idle air sensor"?? on your throttle body will get gummed up and get stuck in that position which in turn will make your engine have a constant high rev... Let us know what u find out, plz!!! I'm curious!!
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Old 04-16-2007, 06:35 PM   #7
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Originally Posted by 4.0l sahara View Post
To me that sounds like a vac leak. You could check by spraying your vac lines with carb cleaner and see if it revs. If it revs there a leak.
I second that, it is almost certainly from a vacuum leak.
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Old 04-16-2007, 06:49 PM   #8
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Ya while your at it clean yout throttle body.
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Old 04-16-2007, 07:03 PM   #9
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i got the same thing on my 00. Few seconds after i stop, it slows down bellow the 3rd mark ~650rpm other wise it stays in the 1500ish till then.. i get 180 on a full tank of gas when the light turns on. So i'd be at 180ish and the gas light would turn on. I gotta clean up my tb since its all black and gui.
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Old 04-16-2007, 09:18 PM   #10
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I don't think a fan clutch would cause it to rev. But I don't really know.
That doesn't sound like the fan clutch. When the fan clutch locks up, the engine has to work harder because it is turning the fan with it's own power all the time. You'll notice a big drop in pick up and particularly on the top end when the fan is locked up.

It's easy to tell if the fan clutch is locked up. Pop the hood and try to move the fan by hand. If it doesn't spin free of the engine, it's locked.

Don't do it with it running. I know I don't have to tell you this, but some people, you never know.

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